DIXI: the Deep Impact eXtended Investigation of comets will observe comet 103P/Hartley 2 during a close flyby in November 2010

Science objectives:- understand the structure, composition, and formation history of cometary nuclei to learn more about the origin of the solar system- understand how features of cometary nucleus relate to features of the coma.- understand deversity between cometary nuclei- understand heterogeneity within cometary nucleus